Datasheet

6

Rev. 1.0, 2011-11-16

ILD4071

Pin Configuration

3

Pin Configuration

3.1

Pin Assignment

Figure 2

Pin Configuration ILD4071

3.2

Pin Definitions and Functions

Pin

Symbol

Function

1VREC

Voltage Recirculation Output and Internal Supply Input;

This pin is the supply pin of the IC (see block diagram). Furthermore the cathode of the

integrated fast freewheeling diode is connected to this pin as well.

2ST

Status Output;

Open collector diagnostic output to indicate an open load failure.

Refer to Chapter 7 for more details.

3EN

Enable;

Apply logic HIGH signal to enable the device

4

SET

SET Input;

Connect a low power resistor to adjust the output current.

5

PWMI

PWM Input;

PWM signal for dimming LEDs. Connect external R and C combination to achieve an auto

PWM-dimming function with defined frequency and duty cycle.

1) internal PWM dimming function (external RC connected to GND)

2) external PWM dimming function (µC is controlling this pin)

Refer to Chapter 6 for more details.

6FREQ

FREQuency Select Input;

Connect external Resistor and Capacitor to GND to set the OFF-time of the switching

frequency.

7GND

Ground;

Connect to system ground.

ST

GND

EN

FREQ

SW

5

6

4

3

2

7

1

8

SET

VREC

PWMI

EP